"The accused told us that he wanted to marry the victim but she wasn't ready," police officer Shailendra Barnwal said. They added that he attacked her on Friday in her relative's house in a village in Pakur district. The accused lived close by.

AFP

Police say the suspect's marriage request had been spurned

According to the police, he waited until she was alone, then broke into the house and raped her before setting her alight.

Neighbours reportedly rushed to the house on hearing her screams and took her to hospital.

The main suspect and 14 others have already been arrested in connection with the earlier rape and burning case in the state. It took place in Chatra district, about 380km (236 miles) from Pakur, late on Friday.

The shocking case in Kashmir and another in Uttar Pradesh state have caused outrage in India.

Following protests, the cabinet approved the introduction of the death penalty for people convicted of raping children.

A number of serious crimes in India carry the death penalty, but raping a child was not among them until now.

About 40,000 rape cases were reported in India in 2016.

Many cases, however, are believed to go unreported because of the stigma that is attached to rape and sexual assault.